CK-12 Foundation
Ck 12: Flex Book Textbooks: Earth Science Concepts for Middle School
[Free Registration/Login may be required to access all resource tools.] A complete, web-based, multi-media textbook covering a wide variety of Earth science concepts for middle grades.
![Foss Web: Pebbles, Sand, and Silt Activities [Pdf] Activity](https://d15y2dacu3jp90.cloudfront.net/images/attachment_defaults/resource/large/FPO-knovation.png "Foss Web: Pebbles, Sand, and Silt Activities [Pdf] Activity")
University of California
Foss Web: Pebbles, Sand, and Silt Activities [Pdf]
Discover how pebbles, sand, and silt are used around us everyday in this set of activities for students.